| 摘要 |
New herbicides especially useful against weeds in cereals or soya, have the formula: <IMAGE> in which: Y1 is a nitrogen atom or a group -CH=, Y2 is a nitrogen atom or, when Y1 is a group -CH=, a group -CX4=, X1, X2 and X3, which are identical or different, each represent a halogen atom or a polyhalogenoalkyl, cyano, nitro, alkyl, alkoxy, alkylsulphonyl, -SO2NH2, nitroso or alkoxycarbonyl group, X4 is as defined for X1, X2 and X3 and can also represent hydrogen, R is a substituted or unsubstituted hydrocarbon radical or a substituted or unsubstituted heterocyclic ring and Y is a hydroxy group or a halogen atom. |
